Public bug reported:

With lxc 2.0.0~rc5-0ubuntu1 the autopkgtest LXC runner is still broken
(even with bug 1551960 fixed) when stderr is a terminal:

$ adt-run gzip --- lxc -s adt-wily
[...]
adt-run [10:15:45]: ERROR: erroneous package: got 10 lines of results from 
extract where 4 expected:
gpgv: Signature made Mon 27 Oct 2014 09:48:46 AM CET using RSA key ID BD4CA59E
gpgv: Can't check signature: public key not found
dpkg-source: warning: failed to verify signature on ./gzip_1.6-4ubuntu1.dsc
Get:1 http://archive.ubuntu.com/ubuntu/ wily/main gzip 1.6-4ubuntu1 (dsc) 
[1,907 B]
Get:2 http://archive.ubuntu.com/ubuntu/ wily/main gzip 1.6-4ubuntu1 (tar) 
[1,075 kB]
Get:3 http://archive.ubuntu.com/ubuntu/ wily/main gzip 1.6-4ubuntu1 (diff) 
[14.9 kB]
/tmp/adt-virt-lxc.shared.xklzp9z7/downtmp/build.ehH/gzip-1.6
gzip
1.6-4ubuntu1
1

Thie first couple of lines are supposed to go to stderr, not stdout.
This works if stderr is not a terminal, but a pipe, with e. g. "adt-run
-l /dev/null gzip --- lxc -s adt-wily" (where stderr is sent to a pipe
which gets tee'ed to both the log file and the real stderr).

This is probably a regression in LXC, and it doesn't happen with older
LXC nor LXD nor any other backend. But it might also be some intentional
change which autopkgtest needs to be adjusted to, so for now I keep
tasks for both projects.

** Affects: autopkgtest (Ubuntu)
     Importance: High
         Status: Triaged

** Affects: lxc (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: lxc (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: autopkgtest (Ubuntu)
       Status: New => Triaged

** Changed in: autopkgtest (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1553097

Title:
  latest LXC breaks autopkgtest's LXC runner

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